Up high on the den walls, more fossil plaster casts from Jones Fossil Farm, Worthington, MN. These specimens include skeletons of the eurapsid reptile Pachypleurosaurus edwardi skeleton, the pterosaur Pterodactylus longirostris, the “first bird” (or feathered theropod dinosaur) Archaeopteryx lithographica (feather impressions not preserved), bony fish Leptolepis sp. and pelycosaur Dimetrodon sp. (juvenile).
